Why are open compressors often started up for a short time in the off season?
What will be an ideal response?
The shaft seal on the compressor is kept "wet" by the circulation of refrigeration oil over it. If the compressor is off for a long period of time, the shaft seal can dry up and eventually leak. Periodic running of the compressor helps keep the shaft seal in good shape.
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One of the major tools in genetic engineering is restriction enzymes, otherwise known as the molecular scissors. They are used to cut the engineered DNA for insulin and the plasmid used to move the DNA into a bacterium. Look up restriction enzymes on the Internet and write a description of the job these enzymes do in nature, as well as the job they perform in the biotechnology field.
What will be an ideal response?
The basic unit of carbohydrate is:
A. Glycerol B. Sugar C. Ammonia D. Pyruvate
The overload contact must be connected in such a manner that it will cause the output of the circuit to turn off if it opens.
Answer the following statement true (T) or false (F)
If you wish to avoid getting run over while crossing a city street, which of the following is recommended?
A. Run very fast B. Obey the rules C. Carry a white walking stick D. Walk to the nearest subway